Speed indicator



P. JARAY.

SPEED INDICATOR. APPLICATION FILED JUNE 28, 1920.

1,428,786. PatentedSept. 12, 1922.

INVENTORZ till Patented ept 3.2, $22.

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Application filed June 28, 1920.

Serial filo. 392,5?3.

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To all whom it may concern: 7 Be'it known that .l, PAUL ilnnnr," a citizen of the Austrian Republic, residing at Fried richshafen, Germany, have invented certain new and useful Improvements in Speed indicators, "for which I have filed application in Germany, May 3, 1918, and of which the following is a specification. I

My inventionre'fers to the measuring of speed and more especially the travelling speed of aerial vehicles and its particular object is to provide an indicator which can easily be accommodated vvithin a dying machine, does not require any connecting tube or pipe and can be used everywhere. The novel instrument according to my invention offers no resistance to the air Worth speaking.

of. It can easily be attached to and detached from any surface, stay or the like of a flying machine and is especially distin guished by its low Weight.

The novel instrument substantially sists of a'hollow body delimited by "W21 1 presenting stream-lines and being provided at its forward end with an opening for a Pitot-tube' the body being the casing foran indicating device belonging tov such a tube.

The measuring andindicating device may be of any suitable kindand construction. An especially simple arrangement is obtained by immediately connecting the for Ward opening, designedto ing pressure, of a. casing confined by stream lines'vvith the interior of a multi-cellular diaphragm disposed in the front portion of the said casing, ac'onnecting rod being rovided for transmitting the movements 0 the diaphragm on to an indicator drum preferably located in thecentralpart of the. interior of the casing, pressure of the outer atmosphere bymeans of lateral openings, a little Window rendering said drum visible from outside.

In order to render the attaching and detaching of an indicator of this kind as simple as possible, I further prefer providing the shellenclosing the measuring and indicatding devices'proper with a clip at its rear en In the drawings afiixed to this specification and forming part thereof an instrument contake up the stow-,

which is exposed to the embodyingmy invention is illustrated by Way of examplein a diagrammatic mann' 7.

in the drawings- F g. 1 isa vertical longitudinal section. F 1g. 2 is a cross-section on the line 2-2 in Fig. 1."

Fig. 3 is a Fig. 1. v

Referring to the drawings, low body delimited by streamdines and provided in a Well-known manner with a for- Ward opening at and a number of lateral openings at A clip a attached. to itsrear end encircles and is pressed thereon by a screw a multi cellular diaphragm C is connected with its open end in an airtight manner to the opening a, its closed free end having attached to it a connecting rod'or spindle E guided in 'a sliding bearing D. has its ends rotatably located in the Walls plan vierv' corresponding to of the bodyA and carriestvvo lever arms G 2 at right angles to one another. Lever G extends substantially at right angles. to the spindle and its forked end embraces a pin 6 provided on the spindle E. The lever G is). linked to an-oscillating lever being pivoted to a crank pin h v on the toothed Wheel 5; This latter Wheel. is located in stationary bearings i of the hollovv body and meshes With a driver K fixedto a sleeve on the hub of an indicator drum L which is secured against displacement and located in bearimgs M. The inner diameter of the sleeve on spindle traversing it. The drum is provided on its circumference with a scale adapted to be read oil through a window a The indicator above described is especially useful inasmuch as it can easily be fined to a stay close to the pilots seat so that this latter can read it oil at any time.

I claim:

1. Ina device of the kind described in combination, a stream lined casing, a P'itot tube in said casing opening towards the front of said casing and an indicating device for the tube within said casing.

2. In a device of the kind described in combination, a stream lined casing, a Pitot tube in said casing opening towards the front A is the holthe stay B be a flying machine An axle F the hub is a little greater thanthe of said casing, a multicellular diaphragm inside said casing extending around and forming part of said tube and an indicating device operatively connected With said diaphragm.

3. In a device of the kind described in combination, astream lined casing, a Pitot tube in said casing opening towards the front of said casing, a multicellular diaphragm inside said casing extending around 10 and; forming part of said tube, a rod connected with said" diaphragm and extending axially Within said casing, and an indicating device operatively connected With said rod.

In testimony whereof I aflix my si ature. 15

?AUL JA AY. 

